I have M60s, and I want to know if I connect them to two amps? One is a AV receiver for movie and the other one is a tube amp for 2-channel music. So I don't have to take banana plugs in and out when I switch between watching movie and listening to the music. I just need to turn off one amp first, and then, turn on the other one. Does this connection cause any problem?
Thanks for your advice!

Tube amps have to be always connected to some speakers when turned on. It can not be connected to a switch box. Otherwise it will burn up the tubes and destroy the output transformer. A tube amp will go into self induced oscillation and will eventually destroy itself.